Neurophotonics has emerged as a major theme at the BiOS symposium in recent years. This image shows a mouse brain, imaged using the "MOST" (Micro-Optical Sectioning Tomography) technique developed by Qingming Luo and colleagues at the Wuhan National Laboratory for Optoelectronics and its spin-out OE Bio, Inc. Credit: Qingming Luo et al.